Device and method in radio communication system

1. A device in a wireless communication system, comprising:

circuitry configured to

obtain a signal quality of a mobile terminal with respect to a source cell;

evaluate, according to a plurality of signal qualities of the mobile terminal with respect to the source cell which are obtained every predetermined period of time, a variation degree of the signal quality of the mobile terminal with respect to the source cell; and

trigger the mobile terminal, according to the variation degree of the signal quality of the mobile terminal with respect to the source cell, to report a measurement result, wherein

the predetermined period of time is pre-set or is determined according to a reporting and evaluation period of the measurement result of the mobile terminal, and

the circuitry is configured to

determine an offset of the variations of the signal qualities of the mobile terminal with respect to the source cell and a target cell according to configuration parameters of the source cell;

calculate a signal quality difference between the signal qualities of the mobile terminal with respect to the source cell and the target cell; and

use a difference between the signal quality difference and the offset as a judgment threshold value for evaluating the variation degree of the signal qualities of the mobile terminal with respect to the source cell and the target cell.

2. The device according to claim 1 , wherein the circuitry is configured to judge, according to the signal quality of the mobile terminal with respect to the source cell, whether a signal quality of the mobile terminal with respect to a target cell is obtained.

3. The device according to claim 1 , wherein the circuitry is configured to:

compare a signal quality difference between current signal qualities of the mobile terminal with respect to the source cell and the target cell with the judgment threshold value determined at a previous time;

update, according to a comparison result, an indicator for indicating the variation degree of the signal qualities of the mobile terminal with respect to the source cell and the target cell; and

trigger the mobile terminal to report the measurement result when a value of the indicator exceeds a predetermined threshold value.

4. The device according to claim 3 , wherein the circuitry is configured to increase the value of the indicator, according to a variation amount of the signal quality difference between the current signal qualities of the mobile terminal with respect to the source cell and the target cell and a signal quality difference between previous time of signal qualities of the mobile terminal with respect to the source cell and the target cell, in the case that the signal quality difference between the current signal qualities of the mobile terminal with respect to the source cell and the target cell is greater than or equal to the judgment threshold value determined at the previous time.

5. The device according to claim 3 , wherein the circuitry is configured to reduce the value of the indicator or keep the value of the indicator unchanged, according a to a variation amount of the signal quality difference between the current signal qualities of the mobile terminal with respect to the source cell and the target cell and a signal quality difference between previous time of signal qualities of the mobile terminal with respect to the source cell and the target cell, in the case that the signal quality difference between the current signal qualities of the mobile terminal with respect to the source cell and the target cell is less than the judgment threshold value determined at the previous time.

6. The device according to claim 3 , wherein the circuitry is configured to reset the indicator or reduce the value of the indicator by a predetermined value in the case that the value of the indicator does not vary within a predetermined period.

7. The device according to claim 3 , wherein the circuitry is configured to:

compare the value of the indicator with a predetermined upper limit value of the indicator; and

not to increase the value of the indicator any longer when the value of the indicator reaches the upper limit value of the indicator, wherein the upper limit value of the indicator is greater than or equal to the predetermined threshold value.

8. The device according to claim 3 , wherein the circuitry is configured to make the mobile terminal stop reporting the measurement result when the value of the indicator is lower than the predetermined threshold value.

9. The device according to claim 1 , wherein the circuitry is configured to update the judgment threshold value each time a signal quality difference between the signal qualities of the mobile terminal with respect to the source cell and the target cell is calculated.

10. The device according to claim 9 , wherein the circuitry is configured to:

pre-set a minimum judgment threshold value; and

when updating the judgment threshold value, set the minimum judgment threshold value as the updated judgment threshold value if the calculated judgment threshold value is less than the minimum judgment threshold value.

11. The device according to claim 10 , wherein the circuitry is configured to trigger the mobile terminal to report the measurement result, if it is detected that there are consecutive predetermined number of measurement results less than the minimum judgment threshold value, after the minimum judgment threshold value is set as the updated judgment threshold value.

12. The device according to claim 10 , wherein the circuitry is configured to trigger the mobile terminal to report the measurement result, if it is detected that there are more than a predetermined number of measurement results less than the minimum judgment threshold value within the predetermined period of time, after the minimum judgment threshold value is set as the updated judgment threshold value.

13. A method for use in a wireless communication system, comprising:

obtaining a signal quality of a mobile terminal with respect to a source cell;

evaluating, according to a plurality of signal qualities of the mobile terminal with respect to the source cell which are obtained every predetermined period of time, a variation degree of the signal quality of the mobile terminal with respect to the source cell; and

triggering the mobile terminal, according to the variation degree of the signal quality of the mobile terminal with respect to the source cell, to report a measurement result, wherein

the predetermined period of time is pre-set or is determined according to a reporting and evaluation period of the measurement result of the mobile terminal and

the method further comprises

determining an offset of the variations of the signal qualities of the mobile terminal with respect to the source cell and a target cell according to configuration parameters of the source cell;

calculating a signal quality difference between the signal qualities of the mobile terminal with respect to the source cell and the target cell; and

using a difference between the signal quality difference and the offset as a judgment threshold value for evaluating the variation degree of the signal qualities of the mobile terminal with respect to the source cell and the target cell.

14. A device in a wireless communication system, comprising:

circuitry configured to

receive an uplink reference signal transmitted by a mobile terminal;

obtain a signal quality of the mobile terminal with respect to a source cell according to the uplink reference signal;

evaluate, according to a plurality of signal qualities of the mobile terminal with respect to the source cell which are obtained every predetermined period of time, a variation degree of the signal quality of the mobile terminal with respect to the source cell; and

transmit, according to the variation degree of the signal quality of the mobile terminal with respect to the source cell, an instruction for triggering the mobile terminal to report a measurement result, to the mobile terminal.

15. The device of claim 14 , wherein the uplink reference signal is a pilot signal transmitted by the mobile terminal.

16. The device of claim 15 , wherein the circuitry is configured to obtain a signal quality of a downlink channel with respect to the source cell according to the uplink reference signal.

17. The device of claim 14 , wherein the uplink reference signal is a Sounding Reference Signal (SRS) pilot signal.

18. A method in a wireless communication system, comprising:

receiving an uplink reference signal transmitted by a mobile terminal;

obtaining a signal quality of the mobile terminal with respect to a source cell according to the uplink reference signal;

evaluating, according to a plurality of signal qualities of the mobile terminal with respect to the source cell which are obtained every predetermined period of time, a variation degree of the signal quality of the mobile terminal with respect to the source cell; and

transmitting, according to the variation degree of the signal quality of the mobile terminal with respect to the source cell, an instruction for triggering the mobile terminal to report a measurement result, to the mobile terminal.

19. A device in a wireless communication system, comprising a memory and a processor, wherein, the storage stores computer instructions, the processor is used for performing the computer instructions stored in the memory to implement a method according to claim 18 .